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### 36.6 Process, Group, and User IDs

: pgid = getpgrp () ¶

  Return the process group id of the current process.

: pid = getpid () ¶

  Return the process id of the current process.

  See also: getppid.

: pid = getppid () ¶

  Return the process id of the parent process.

  See also: getpid.

: euid = geteuid () ¶

  Return the effective user id of the current process.

  See also: getuid.

: uid = getuid () ¶

  Return the real user id of the current process.

  See also: geteuid.

: egid = getegid () ¶

  Return the effective group id of the current process.

  See also: getgid.

: gid = getgid () ¶

  Return the real group id of the current process.

  See also: getegid.